Barclays analyst sends 'commandments' email to interns

A new group of summer interns is getting started at Wall Street firms, seeking guidance from older employees who know the ropes. One Barclays employee took it upon himself to dish out blunt advice to the bank's new go-getters.

An email from Justin Kwan, who works as an analyst at the firm, is making the rounds around Wall Street. The email obtained by CNBC - titled "Welcome to the Jungle"- runs through Kwan's "10 Power Commandments" for the bank's Global Power and Utilities interns.

Kwan writes the interns are expected to leave the office last every night and never take off their jackets at work. Kwan recommends bringing a pillow, as it eases the "very likely scenario" of sleeping under a desk.

Keeping an extra tie or scarf could come in handy, as associates may run out of napkins, Kwan said.

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